Mam Kartik weight is just 13kg at this age. what to do

A. Hai good morning !! Baby weight is lower range according to age,the ideal weight of 3.7 year old should be 13-18 kg. If baby is active and achieving milestones ,growing well then improve diet protein rich ,calcium ,good fat foods which helps in weight gain. Daily or alternate days Banana,dal(pulses,legumes with rice,paneer/egg/meat) . Full fat milk,curd,nuts (soaked or nuts ladoo/barfi).